进行对比：

　　The advantages for A outweigh the disadvantages of…

　　Although A enjoys a distinct advantage …

　　Indeed , A carries much weight than B when sth is concerned.

　　A maybe … , but it suffers from the disadvantage that…

　　承上启下：

　　To understand the truth of …, it is also important to see…

　　A study of … will make this point clear

　　让步：

　　Certainly, B has its own advantages, such as…

　　I do not deny that A has its own merits.

　　结尾：

　　From what has been discussed above, we may safely drawthe conclusion that …

　　In summary, it is wiser …

　　In short…